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So after a week of using I don't see any major advantages/disadvantages of Qwant as compared to DuckDuckGo. They are both perfectly usable on daily basis.
They have _slightly_ different profile: DDG is very strong in dev topics, it will always prefer results from StackOverflow etc. Qwant on the other hand is slightly better in general topics as it seems to have broader and more diverse set of sources. As I said, these differences are quite small.
Oh, and both allow !g fallback.